Core breaker and lifter for rock-drills.



No. 643,082. Patented Feb, 6, I900. M. C. BULLOCK, Decd.

M. A. BULLOCK. Executrix. CURE BREAKER AND LIFTER FOB ROCK DRILLS.

(Application filed Sept. 22, IQQB.)

(No Model.) a sheets-sa a: l.

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(Application filed Sept. 22, 1898.)

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GORE BREAKER AND LIFTER FOR BUCK DRILLS.

(Applicatiop filed Sept. 22, 1898.)

(No Model.)

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MILAN C. BULLOCK, OF CHICAGO, ILLINOIS; MARY A. BULLOCK, EXECUTRIX OFSAID MILAN C. BULLOCK, DECEASED, ASSIGNOR TO MARY ANN BUL- LOCK.

CORE BREAKER AND LIFTER FOR ROCK-DRILLS.

$PECIFICATION forming part Of Letters Patent NOu 643,082, dated February6 1900.

Application filed September 22, 1898- Serial No. 691,604. (No model.)

To all whom, it may concern:

Be it known that I, MILAN O. BULLOCK, of Chicago, in the county of Cookand State of Illinois, have invented certain new and use fulImprovements in Core Breakers and Lifters for Rock-Drills; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon, which form a part ofthis specification.

This invention relates to an improved corebreaking and core-liftingdevice for drilling apparatus of that kind having rotary tubular bits orcutters, such as are commonly known as diamond drills. V

In a separate application for Letters Patent filed by me on the 22d dayof September, 1898, Serial No. 691,603, I have shown a drillingapparatus having a drill-rod or corebarrel, a cutting-head which ismovable with respect to the drill-rod or core-barrel, and core grippingdevices which are actuated automatically through the movement of thecutting-head with respect to the drill-rod or core-barrel.

The present invention embraces the general principles of constructionillustrated in said prior application and constitutes a species of thegeneric invention therein set forth. In the mechanism specificallyillustrated in the prior application the core-gi'ippin g device isactuated through a rotative movement of the cutting-head with respect tothe drill-rod or core-barrel. In the present application another form ofcore-actuating means is employed, wherein the cutting-head has anendwise-sliding or telescopic movement with respect to the drillrod orcore-barrel, and the actuation of the core-gripping device is effectedsolely through such telescopic movement, the parts being so arrangedthat when the drill-rod is thrust forward in cutting or drilling thecutting-head will be moved backwardly, and thereby relieve the grippingde vice from contact with the core, and when the drill-rod is withdrawnthe cutting-head will be advanced with respect thereto and close thegripping device upon the core.

The invention consists in the matters hereinafter described, and pointedout in the appended claims.

As shown in the drawings, Figure 1 is a sectional view of a deviceembodying my invention, showing the core-breaker out of contact with thecore and the drill in position for drilling. Fig. 2 isasectional view ofthe same device, showing the core-breaker in operative engagement withand lifting the core. Fig. 3 is an elevation of a device embraced in myinvention. Fig. 4 is an elevation of a longitudinally-ribbedcoupling-sleeve embodied in my invention. Fig. 5 is a section on line 55 of Fig. 2. Fig. 6 is a view of one form ofcore-breakerembracedin'myinvention. Fig. 7 is a section on line 7 7 ofFig. 2. Fig. 8 is a view of a carrier-shell having apertures throughwhich the core-breaker jaws operate.

Adevice embodying myinvention,asshown in the said drawings, embraces atubular drill-rod A, a core-lifter shell B, havingserewthreadedengagement with the lower end of the drill-rod A, a coupling-sleeve C,having a sliding or telescopic engagement with the lower end of thecore-lifting shell B, and a cutting-head D, attached at its upper end tosaid coiipling sleeve. The coupling -sleeve C is provided with externallongitudinal ribs or grooves and is engaged with the shell 13 by meansof a notched or grooved inwardly-projecting part or flange on the lowerend of said shell, herein shown as formed by means of a separate ring H,connected by screw-threads with said shell. The said sleeve C has at itsupper edge a stop-flange c, which by contact with the upper edge of thering H prevents separation of the parts .and limits the downwardmovement of the drill-head with respect to the said shell. A slidingshell or cylinder E is located within said core-lifting shell B andengages at its lower end the couplingsleeve C, and a spiral spring Fsurrounds the upper part of said shell E and operates by endwiseexpansion to throw downwardly or outwardly the said shell and theconnected coupling-sleeve and drill-head. Said spring is located betweenthe upper part of the shell E and the part of the shell B whichsurrounds the same and is held or confined at its ends by contact with ashoulder on the drill-rod too at its upper end and a shoulder on theshell E at its lower end. Conveniently the bearing-shoulder for theupper end of the spring is formed by the lower end of the drill-rod A,while that for its lower end is formed by a ring 8, which is secured byrivets to the said shell E. Serrated wedge-shaped gripping-jaws G arelocated within the shell B and engage an inclined or conical interiorsurface Z), which forms within the shell a conical recess larger at itsupper than at its lower end. The inner or gripping faces of said jawsextend through openings 6 in the shellE. Said jaws are shown as havingthe form of blocks eonnccted by intermediate parts or webs, so as toform a ring, as shown in Fig. '7, said ring being cut or split at onepoint to enable it to expand and contract as the jaws are moved inwardlyor outwardly. The core is indicated by M in the drawings.

Referring to the details of construction illustrated, the tubulardrill-rod A is provided at its lower end with an externallyscrewthreadedportion a of less diameter than the drill-rod and formingan externalshoulder a. The inner part of the lower end of said drillrod is reamedout to form an annular recess to receive the upper end of the shell F,which is adapted to slide therein, the upper limit of said recessforming the shoulder Q The said drill-rod is also provided with anexternal spiral. clearance-groove a in a familiar manner. Thecore-lifter shell 13 has the same external diameter as the saiddrill-rod A and is also provided with a spiral clearance-groovecontinuous with that of the drill-rod when the said shell B is in placeupon the drill-rod. The upper end of said shell B is provided on itsinner surface with the screw-thread 1), adapted to be engaged by thescrew-threaded end a of the drill-rod. The thickness of the shell B atthe said part is equal to the depth of the said shoulder a, so that theouter surfaces of the said drill-rod and said shell B form a continuouscylindrical surface, and the spiral grooves of the said shell B arecontinuous with the similargrooves a a of the drillrod. The innersurface of the said shell B is enlarged above the conical part thereofto re ceive the spring F, which surrounds the upper part of the saidshell below the lower end of the drill-rod. The lower end of said shellB is provided with a cylindric enlargement 12 in which the stop-flange cof the couplingsleeve fits and slides. The lower end of saidcore-lifting shell is provided with an interior screw-thread adapted toreceive the externally-screw-threaded end of the notched ring H, whichis, in effect, an extension of the corelifting shell. The said ring H isprovided with inner longitudinal notches h, (shown on Fig. 5,) whichengage the ribs on the couplingsleeve.

The eore-bitD may be of any approved design, but as herein shown is ametal ring armed with diamond cutters at its lower edge, and is attachedby a screw-thread to the coupling-sleeve O. The said sleeve has aninterior diameter slightly greater than the core and is provided withexternal screwthreads at its lower end adapted to engage similarinternal screw-threads in the upper end of the cutting-head. This mannerof engagement with the cutting-head causes the upper end of thecutting-head to constitute an upwardly-facing shoulder d. The upper endof the said coupling-sleeve C is provided with an outwardly-extendingflange 0, having an external diameter equal to the interior diameter ofthe core-lifting shell at the enlargement or recess 12 The bore of saidsleeve 0 is reamed out at its upper end to receive the lower end of thecylindrical carrier-shell E, hereinafter described. The saidcouplingsleeve is provided externally with longitudinal ribs 0,corresponding with the notches h of the ring H and adapted to slidetherein. Said ribs and notches are provided to communicate the rotarymotion of the drill-rod to the cutting-head. The sliding shell E restsupon the upper end of the said couplingsleeve, and the inner surfaces ofthe couplingsleeve and carrier-shell form one continuous cylindricalsurface, and the length of the said carrier-shell is such that when thesaid coupling-sleeve C is at its lower point the carriershell restingthereon shall extend upwardly until the upper endthereof shallextendinto the enlargement in the end of the tubular drill-rod. Thelower ends of the grippingjaws G are beveled inwardly,as shown in Figs.1 and 2, and are adapted to engage the edges of the sliding shell at thelower parts of the aperture 0 so thatwhen the said carriershell isforced upwardly the lower wall of the aperture will press outwardly onthe jaws and carry them out of contact with the core and into the upperpart of the conical recess.

The operation of the device is as follows: When the apparatusconstructed as described is set in operation, the thrust of thedrill-rod A against the resistance of the rock causes the spring F to becompressed until upward movement of the drill-head is arrested bycontact of its upper end with the ring 1-1. As shown in Fig. 1, owing tothe taper of the surface I) and the beveled shape of the lower end ofthe core-gripping jaws G, as heretofore described, the jaws will beforced upward and outwardly to the position shown in said Fig. 1. Inthis position the core-breaker is entirely out of contact with the coreand will so remain so long as operative pressure is maintained upon thecutting-head. When the drill-rod is raised, the spring F immediatelyexpands and the carrying-sleeve E and all parts engaged therewith areforced downwardly to the position shown in Figs. 2 and 3. This movementis of course aided by the weight of the drill-head. The inclined surfaceI) acting on the gripping-jaws G forces the said jaws inwardly intocontact with the core, as shown in said Fig. 1. It is obvious that inthis position the greater the upward will grip the core.

When the gripping-jaws and the metal parts connecting them are adaptedto constitute a spring-ring, as shown, said ring may be made of suchdiameter that the tension of the springs will either tend to close thejaws on the core or to hold them free therefrom, the spring in one caseaiding the actuating-spring F and in the other case supplementing theeX- panding devices in throwing the jaws away from the core. The ringmay, however, be made of an intermediate size, so that it will be madeneutral, and both expansion and contraction in that case will beeffected solely by the action of the said spring or by the upward thrustof the sliding shell. Obviously the connecting parts between the jawsserve merely as a means of holding them in place; but as the openings inthe shell also perform this function the said connecting parts may beomitted and a series ofseparate jaws employed. It is also obvious thatthe spring F may be omitted, and the gravity of the cuttin g-head andconnected parts may be utilized to ad vance the cuttin g-head in thewithdrawal of the drillrod.

From the above description of the construction and operation of thedevice illustrated it will be clear that in this invention thecuttinghead has an endwise or telescopic movement with respect to' thedrill-rod or core-barrel and that the actuation of the core-grippingdevice is effected automatically and solely by such endwise-sliding ortelescopic movement of the cutting-head. In the apparatus herein shown,therefore, a distinctive feature is the endwisesliding or telescopicmovement of the cuttin head as distinguished from a rotative or combinedrotative and endwise movement of the cutting-head, such as is presentedin the device illustrated in the said prior application hereinbeforereferred to.

I claim as my in vention- 1. The combination with a dr,illr0d of anannular cutting-head which slides endwise with respect to the drill-rod,an expansible core-gripper and means actuated through the endwisemovement of the cutting-head acting to hold the core-gripper extendedduring the operation of drilling.

2. The combination with a drill-rod of an annular cutting-head which ismovable endwise with respect to the drill-rod, an expansiblecore-gripper comprising endwise and radially movable grippingjaws andmeans actuating said jaws, comprising an inclined surface of theinterior of the drill-rod, and

connecting means between the cutting-head and said jaws by which thelatter are moved with respect to the inclined surface in the endwisemovement of said cutting-head.

The combination with a drill-rod of an annular cutting-head which ismovable endwise with respect to the drill-rod, a spring applied toextend the cutting-head, an expansiblc core-gripper and actuating meansfor the core-gripper embracing operative connections with thecutting-head, whereby the coregripper is contracted when thecutting-head is thrown outwardly by said spring, and extended when saidcutting-head is forced inward by pressure against the rock in drilling.at. The combination with a drill-rod of an annular cutting-head which ismovable endwise with respect to the drill-rod, a spring applied toextend the cutting-head, an expansible core-gripper and means foractuating said core-gripper, embracing an inclined surface on thedrill-rod and a connection between the moving parts of the gripper andthe cuttinghead by which the said moving parts are ac tuated through theend wise movement of the cutting-head.

5. The combination with a drill-rod provided with an inclined interiorsurface, of an annular cutting-head which is movable endwise withrespect to the drill-rod, an expansi ble core-gripper, embracing jawswhich en gage and slide endwise upon said inclined surface of thecore-barrel and an operative connection between said cutting-head andsaid jaws, acting to move the said jaws within the drill-rod when thecutting-head is moved with respect to said drill-rod.

6. The combination with a drill-rod provided with an interior inclinedsurface, of an annular cutting-head which is movable endwise withrespect to said drill-rod, an expansible core-gripper, embracing jawswhich engage said inclined surface of the drill-rod, connecting meansbetween the cutting-head and jaws acting to move said jaws endwise withthe cutting-head and a spring applied between the cutting-head and thedrill-rod to extend the cutting-head.

7. The combination with a drill-rod provided with an interior inclinedsurface, of an annular cutting-head which is movable endwise withrespect to the drill-rod, acore-gripper, embracing jaws which engage andslide endwise upon said inclined surface, and a sliding sleeveconnecting said jaws with the said cutting-head.

8. The combination with a drill-rod provided with an interior inclinedsurface, of an annular cutting-head which is movable endwise withrespect to the drill-rod, a core-gripper, embracing jaws which engageand slide endwise upon said inclined surface, a sliding sleeveconnecting said jaws with the said outting-head, and an actuating-springapplied between the said sleeve and the drill-rod.

9. The combination with the drill-rod of an annular cutting-headprovided with a longitudinally-grooved sleeve which has slidingengagement with a notched flange on the drillrod, a core-gripperandactuating means for operating the core-gripper through the endwisemovement of the cutting-head with respect to the drill-rod.

10. The combination of a tubular drill-rod provided with an interiortapered surface and with a notched flange at its lower end, of an IIOannular cutting-head provided with a longitudinally-grooved sleeve whichhas sliding engagement with said notched flange, a grip-- ping device,embracing jaws which slide upon said inclined surface, and connectingmeans between the jaws and said cutting-head for actuating the formerfrom the latter.

11. The combination of a tubular drillingrod provided with an interiortapered surface, an annular cutting-head which has endwiseslidingengagement with the drill-rod, a sliding sleeve within the drill-rodengaging with said cutting-head and provided with openings forgripper-jaws, and gripper-jaws engaging with said openings and bearingagainst th inclined surface of the drill-rod.

12. The combination with a drill-rod provided with an interior conicalsurface, an annular cutting-head having endwise-sliding engagement withthe drill-rod, a sliding sleeve engaging with the cutting-head andprovided with an opening for gripping-jaws, grippingjaws which engagesaid openings and bear against the said inclined surface, and a coiledspring surrounding said sleeve and bearing at one end against a shoulderon the drill-rod and at its opposite end against a shoulder on saidsleeve.

13. The combination with a drill-rod provided with an interior taperedsurface, a drillhead having endwise-sliding engagement with saiddrill-rod, a sliding sleeve connected with said drill-head and providedwith openings to engage clamping-jaws, clamping-jaws to bear against thesaid inclined surface and engage said openings, said clamping-jaws beingprovided with inclined surfaces adapted for engagement with said slidingsleeve and acting to throw outwardly the clamping-jaws when thecutting-head and sleeve are thrust inwardly.

In testimony that I claim the foregoing as my invention I affix mysignature, in presence of two witnesses, this 2d day of September, A. D.1898.

MILAN C. BULLOCK.

Witnesses:

CHARLES S. BARTHOLF, R. CUTHBERT VIVIAN.

